The "instrument" that one is said to be playing when strumming an imaginary guitar. I never had any sort of music lessons as a kid—the only instrument I can play is the air guitar.When I walked in, all of the kids were jumping around and playing air guitar to the blaring music.
air guitar
n. an imaginary guitar, played along with real music. Jed, who sees himself as some sort of rock star, plays air guitar when he’s happy or sad.